September weather forecast
Manila, Philippines

In September, the monsoon season in Manila starts to show signs of withdrawal, and a decline in the frequency of rainfall ensues. It is a month of transition with weather patterns fluctuating between the pending arrival of a drier spell and the departure of the wet season. The city’s overall climate, compared to August, experiences lower rainfall and minor changes in other parameters. September offers comparatively more sunshine hours than the gloomier month of August. Moving into October, the city observes a further decrease in rain, paving the way for the upcoming dry season.

Temperature

A minimal variation is noted in Manila's average high-temperature at the onset of September, reaching a still hot 30.5°C from August's 30.3°C. Throughout September, Manila witnesses a consistent average low-temperature of 24.8°C.

Heat index

September's average heat index is appraised at an extremely hot 40°C. Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle winds. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

August and September, with an average relative humidity of 81%, are the most humid months.

Rainfall

In Manila, in September, during 21 rainfall days, 128mm of precipitation is typically accumulated. In Manila, during the entire year, the rain falls for 185 days and collects up to 830mm of precipitation.

Sea temperature

In Manila, in September, the average water temperature is 28.7°C.
Note: Water activities in temperatures ranging from 25°C to 29°C are pleasurable, without feeling uncomfortable even during extended periods.

Daylight

The average length of the day in September is 12h and 13min.
On the first day of September in Manila, Philippines, sunrise is at 5:43 am and sunset at 6:08 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 5:46 pm PST.

Sunshine

The average sunshine in September in Manila, Philippines, is 8.4h.

UV index

February through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: An average maximum UV index of 7 in September leads to these recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Beware! Reflections from sand and water can intensify the Sun's UV radiation.